Product for prevention of furring in boilers.



UNITED STATES Patented beeember 29, 1903.

PATENT OFFICE.

PAUL BEZ, OF LERAN, FRANCE.

PRODUCT FOR PREVENTION OF FURRING IN BOILERS.

SPECIFICATION forming part of Letters Patent No. 748,341, dated.December 29, 1903.

Application filed July 2, 1902. serial No. 114,136. (No specimens.)

To all whom it may concern.-

Be it known that I, PAUL BEZ, canner, a citizen of the Republic ofFrance, residing at Lran, Arige department, in the Republic of France,have invented certain new and useful Improvements in Products for thePrevention of Furring in Boilers, of which the following is aspecification.

The present invention relates to a product intended notonly to preventfurring inboilers containing natural or purified waters, but also toallow of heating under pressure in ordinary boilers a dense solution ofvarious salts or their equivalents,thereby both keeping the boiler cleanand making a better use of the heat generated, this being done withoutthe formation of adhesive deposits and without disassociating of thechlorids.

As disincrusting substances I use, preferably, a mixture of bariumchlorid, tannin, and mucilaginous, pectic,and gelatinous matters comingfrom tanning operations. The said mixture is approximately composed asfollows: barium chlorid, two hundred and sixty parts; purified tannin,forty parts; mucilaginous matters, twenty parts.

To disincrust boilers to which natural waters more or less charged withalkaline ter reous salts have been fed, it only requires comparativelysmall quantities of the above mixtnre-for example, such quantities aswill increase the density of the water to the extent of a few tenths ofa degree Baum.

The said disincrusting mixture used alone in the specified smallquantities is advantageous in that it prevents the crystallization ofthe calcareous salts and that it exercises no injurious influence on thesheet metal of the boilers either by itself or through the products ofdecomposition to which it gives rise; but the important feature of myinvention consists in adding to the feed-water such a quantity ofsuitable soluble matters as will notably increase the density of thewater and will cause the impurities arising from the disincrustingaction to be maintained in suspension. For this purpose 1 preferably addto the feed-water a quantity of the hereinbefore-specified disincrustingmixture considerably greater than that required to produce theprecipitation of the alkaline terrous salts. For example, I use the saiddisincrusting mixture in such a proportion that the density of the waterin the boiler will rise to 5, 10, 20 Baum and even more.

Insteadof the disincrusting mixture specified above I may Without anydeparture from the principle of my invention use other disinorustingsubstances to precipitate the alkaline terrous salts contained in thefeed-water and also other soluble substancesfor example, sodiumchloridto increase the density of the Water and maintain the insolublematters in suspension. The said soluble substances may be the same asthose mentioned in the example given or they may be different theronefrom another.

As feed-water any kind of natural water more or less charged with saltsand even seawater may be used. To the contrary of the ideas which arenow prevalent I preferably use waters which are freely charged withsalts.

The sulfates and the barium chlorid are broken up and barium sulfate isformed. This is a substance which is tenuous and insoluble and one whichdoes not adhere to the boiler. The new chlorids thus formed, eminentlysoluble, will be indecomposable by the heat on account of the presenceof numerous polychlorids opposed, asis well known, to the decompositionof instable chlorids. The tannins will decompose the bicarbonates andcarbonates to give with their salts insoluble and light lacs insuspension. The gelatinous and mucilaginous matters will give complexproducts in suspension with all the salts, either in solution or on thepoint of being precipitated through excess of concentration. The highdensity given to the waters by the salts in solution facilitates thesuspension of the impurities which are formed. Well, now, the saidimpurities in suspension, subjected to the conveyinginfluence,constitute as many elements for conveyingthe heat whichis thuscirculated and transmitted through theliquid mass. Dense water holdingin dissolution a salt boils at a higher temperature than distilledwater. Tumultuous ebullitions will be suppressed by reason of thepresence of the impurities in suspension, which increase the number ofpoints where steam bubbles are formed, and consequently facilitateregular ebullition without water beingcarried along,

as shown by Gernez. The steam generated in this way will therefore bevery dry. The metal plates of the boilers remaining black, although veryclean, will keep their greatest power of emission and their greatestconductibility-that is to say, that they will always transmit under thebest conditions the heat supplied by the furnace to the water.

From the foregoing it will be seen that my process considerablyincreases the production of steam per square meter of heating-surfaceand makes a better use of the heat generated.

There is no inconveniency in putting into the boiler large quantities ofthe disincrusting mixture above specified, because, on the one hand, thesaid mixture does not attack the metal plates and, on the other hand,the losses through being carried away or through decomposition under theinfluence of the heat amount to nothing.

The reactions which take place between the calcareous salts and theabove-mentioned disincrusting mixture take place also between the latterand the tartars heretofore produced even when the latter are very hard,so that my process allows of cleaning boilers in which tartar hasbeenformed.

The chief advantages of my process are as follows: It maintains themetal plates of the boilers constantly clean without corroding the same,it prevents water being carried along, and it allows the use-of verycalcareous or selenetical waters and even of impurified sea-water.

I claim- 1. A product for preventing furringin boilers, comprising anadmixture of barium chlorid and tannin.

2. A product for preventing furring in boilers, comprising two hundredandsixty parts of barium chlorid and forty parts of tannin by weight.

3. A product for preventing furringin boilers, comprising an admixtureof two hundred and sixty parts of barium chlorid, forty parts oftannin,'and twenty parts of mucilaginous substances.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

PAUL BEZ.

Witnesses:

EDMOND BLETRY, MAURICE Roux.

